http://invest5wf2dctgqw2otcsq24wozas43f5mixti4u5wf6iwxcdod6vjyd.onion/monero-difficulty/index28.html
Merkle trees, by the way, are named for Ralph Merkle, a pioneer of asymmetric cryptography who proposed the idea in his 1980 paper.33 His intended application was to produce a digest for a public directory of digital certificates. When a website, for example, presents you with a certificate, it could also present a short proof that the certificate appears in the global directory.